Two Trees Management recommends slightly different rates: $100-$300 for a super; $75-$200 for a handyman; $25-$100 for a porter; and $75-$125 for a concierge.

Or, brokerage Triplemint has made an online calculator where you can plug in your personal housing details and end up with an appropriate tip.

Either way, a poll last year showed 36 percent of renters in buildings without doormen didn’t do any tipping, while a much lower percentage of owners skipped out on tipping. Don’t become a statistic; do the right thing.